JimH notes: You have to think twice to solve the theme answers. First, find a word that answers the clue. Second, find a meta clue that points to that answer. For example, at 97 Across, "Memorable humorous poet" could be NASH but for the answer, think twice, and enter ANTIQUE CAR. Here's another. 36 Down, "Edward or Norman" points to LEAR so that would make the meta-answer REGAN'S FATHER.